dico.py

rendering_dictionnary = {
        "assignment": [
            ("key",      "target"           ),
            ("list",     "first_formatting" ),
            ("key",      "operator"         ), # ceci devrait être optionnel
            ("constant", "="                ),
            ("list",     "second_formatting"),
            ("key",      "value"            )
        ],
    }

# vs

@node()
def assignment(node):
    yield dump_node(node["target"])
    yield dump_node_list(node["first_formatting"])
    if node.get("operator"):
        # FIXME should probably be a different node type
        yield node["operator"]
    yield "="
    yield dump_node_list(node["second_formatting"])
    yield dump_node(node["value"])